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I am using mobius point and shoot camera and customized white balance setting (R-250, G-500, B-900). It it still shows blue values ( see the rooftop of the shops). What could be the problem here. How to reduce the blue from the image?

Ah, well, the NDVI algorithm only compares infrared and visible light, so there are plenty of materials that have high NDVI values, but aren't productive vegetation. Plastics, nylons, etc can have such colors, which is probably what we're seeing in your photo - plastic tarps or roofing materials and people wearing synthetic textiles. You can read more at #ndvi - i hope that helps!

@cfastie I am using mobius actioncam. So I am using modified mobius camera from public lab. i have read some manuals here and experimented myself and finally settled with (R-250, G-500, B-900). Do you have any suggestions?